Spoiler: He is the regressing time everytime she fails (dies)
Wdym? Sorry can you explain further, every time she dies he regressed time?
Yes. It's a spoiler. Don't Read if you don't wanna get spoiled
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He has a responsibility to rewind time when she fails to kill her biological father. She fails as in She dies, he dies his children dies everyone dies , the world dies so she has to regress and try again. He's incharge of rewinding time. This is her 100th try Iirc. Alex is truly trying to save everything , To let him keep rewinding time she's made him immortal, he's stuck in age 20 for eternity until she succeeds . It's actually so sad. Read novel for more details. One of the best Time travel OI I've ever read.
Can you explain more? What about Korea?
Her father got reincarnated too?